Challenge glitched on The Experiment

So, I was playing on The Experiment when a challenged popped up to kill Varelsi marksmen. For some reason, it would not count the marksmen we killed. Then when the timer got to 0, instead of ending, the timer just began to run into the negatives.

Yup, challenges do odd things sometimes. I’ve seen the clock go negative before, and also had some funky numbers for the target.

I’ve heard of similar things before lol. It appears to be common on all levels/missions